About Target_class
Target_class is a single target export variable and a target length export variable. Target_class is also exported when Database format is selected under the Analysis by cells section of the Export page of the EV File Properties dialog box.
It reports the manually identified and stored target class for each single target exported. It is exported for all single target and target length data exports, but will only have meaningful values for single target and length variables that were created from multibeam data.
See also
Target properties from multibeam data
Single target analysis variables
About target properties